ISSN:
1573-5060
Keywords:
Triticum spp.
;
wheat
;
disease severity
;
heading date
;
plant height
;
Septoria Progress Coefficient
;
Septoria tritici
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary The relationships between disease severity (percent pycnidia of Septoria tritici on the four uppermost leaves) and the vertical disease placement expressed as the ratio between disease height (cm)/plant height (cm), (referred to as SPC (Septoria Progress Coefficient)), and between maturity level (days to heading) and SPC, were evaluated for 9500 wheat and triticale accessions tested in field trials during 1977–1981. The relation between disease severity and SPC fitted a quadratic equation in which four distinct cutivar response classes were categorized: A) PCD (percent disease)≤15.0/SPC≤0.400 (highly resistant cultivars); B) PCD≤15.0/SPC (0.400–0.650) (moderately resistant); C) PCD (15.0–40.0)/SPC (0.400–0.700) (moderately susceptible); and D) PCD≥40.0/SPC〉0.700 (highly susceptible cultivars). It is suggested that cultivars assigned to classes B and C which exhibit low receptivity and moderate to high vertical pathogen placement differ in nature and type of protection from that expressed by the highly resistant cultivars in class A. Representative cultivars belonging to each of the classes are listed together with their agronomic characteristics (plant height and maturity level).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00021453
